70009 Parallax Inc, 70009 Datasheet - Page 54

• Manufacturer Part Number: 70009
• Description: BOOK UNDERSTANDING SIGNALS
• Manufacturer: Parallax Inc
• Type: Signal Analysisr

Specifications of 70009

• Style: Book
• Title: Understanding Signals
• Contents: Guide to Generate, View and Measure Wave Forms
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Other names: 70009PAR

Your two measurements should be very near 2 kHz and 6 kHz.
Summary
Even though the OPTAscope is a digital oscilloscope, it is well suited to view both digital
and analog signals. Digital signals are usually either high or low, whereas analog signals
can be high, low, or at any voltage in between. Sound waves are made up of sine waves.
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Set the Horizontal dial to 1 ms. You should see a compressed view of the mixed
signal.
Press the FFT button, and the FFT Window will open (Figure 3-11).
Select Black - Harris in the Windowing box.
Click on the ON/OFF button in the Cursor box to turn on the FFT cursor.
Locate the FFT cursor, a white vertical line with a square handle all the way to
the left in the FFT Plot Area.
Move the cursor to the first peak to the right.
Read the Frequency measurement in the Cursor box.
Repeat to measure the second peak.
Figure 3-11:
The OPTAscope
FFT Window.
Note that the FFT
cursor measures
near 2 kHz at the
first peak.